diff options
Diffstat (limited to 'gnu/packages/patches/jemalloc-arm-address-bits.patch')
| -rw-r--r-- | gnu/packages/patches/jemalloc-arm-address-bits.patch | 39 |
1 files changed, 39 insertions, 0 deletions
diff --git a/gnu/packages/patches/jemalloc-arm-address-bits.patch b/gnu/packages/patches/jemalloc-arm-address-bits.patch new file mode 100644 index 0000000000..f2ef24c25a --- /dev/null +++ b/gnu/packages/patches/jemalloc-arm-address-bits.patch @@ -0,0 +1,39 @@ +From 8cfc9dec37b312a2686f602bbcdd102ca07cca99 Mon Sep 17 00:00:00 2001 +From: David Goldblatt <davidgoldblatt@fb.com> +Date: Fri, 29 Sep 2017 13:54:08 -0700 +Subject: [PATCH] ARM: Don't extend bit LG_VADDR to compute high address bits. + +In userspace ARM on Linux, zero-ing the high bits is the correct way to do this. +This doesn't fix the fact that we currently set LG_VADDR to 48 on ARM, when in +fact larger virtual address sizes are coming soon. We'll cross that bridge when +we come to it. +--- + include/jemalloc/internal/rtree.h | 12 ++++++++++++ + 1 file changed, 12 insertions(+) + +diff --git a/include/jemalloc/internal/rtree.h b/include/jemalloc/internal/rtree.h +index b5d4db39..4563db23 100644 +--- a/include/jemalloc/internal/rtree.h ++++ b/include/jemalloc/internal/rtree.h +@@ -178,9 +178,21 @@ rtree_leaf_elm_bits_read(tsdn_t *tsdn, rtree_t *rtree, rtree_leaf_elm_t *elm, + + JEMALLOC_ALWAYS_INLINE extent_t * + rtree_leaf_elm_bits_extent_get(uintptr_t bits) { ++# ifdef __aarch64__ ++ /* ++ * aarch64 doesn't sign extend the highest virtual address bit to set ++ * the higher ones. Instead, the high bits gets zeroed. ++ */ ++ uintptr_t high_bit_mask = ((uintptr_t)1 << LG_VADDR) - 1; ++ /* Mask off the slab bit. */ ++ uintptr_t low_bit_mask = ~(uintptr_t)1; ++ uintptr_t mask = high_bit_mask & low_bit_mask; ++ return (extent_t *)(bits & mask); ++# else + /* Restore sign-extended high bits, mask slab bit. */ + return (extent_t *)((uintptr_t)((intptr_t)(bits << RTREE_NHIB) >> + RTREE_NHIB) & ~((uintptr_t)0x1)); ++# endif + } + + JEMALLOC_ALWAYS_INLINE szind_t |